well in my experience the acekart quality is not the best... believe it or not, among all my carts (AK2i, R4DS, R4SDHC, R4i, EDGE and R4i-SDHC(red)) the R4i-SDHC third gen its the best built... now, in terms of compatibility the acekart top the others my second best is the R4i-SDHC.